Ground-crossing belt protection device of slewing mechanism

Abstract

The utility model discloses a ground-crossing belt protection device for a slewing mechanism. The ground-crossing belt protection device comprises a mounting bracket and a magnetic induction limit switch arranged on the mounting bracket, the mounting bracket comprises a first bracket, a second bracket and a third bracket; the first bracket is connected with the slewing mechanism; the second bracket and the third bracket are arranged on the rotary platform; the magnetic induction limit switch comprises a limit magnet, an S-polarity magnet and an N-polarity magnet which are arranged above the revolving platform; the limiting magnet is arranged on the first bracket and rotates above the revolving platform along with the first bracket; the S-polarity magnet is arranged on the second support, the N-polarity magnet is arranged on the third support, and the S-polarity magnet and the N-polarity magnet are arranged close to the two sides of the rotation sector section of the rotation mechanism respectively. According to the utility model, signals in the rotation sector section can be prevented from being interrupted, the electrical control requirement is met, the equipment operation stability is improved, the equipment failure rate is reduced, and the reliable operation of equipment during operation is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of slewing mechanisms of bucket wheel stackers and ship loaders, in particular to a slewing mechanism ground-crossing belt protection device. Background Art

[0002] Bucket wheel excavator, also known as bucket wheel stacker and reclaimer, is a widely used bulk material loading and unloading equipment. The function of its upper slewing mechanism is to realize the fixed-axis rotation of all structures above the bucket wheel excavator's slewing support around the slewing center line, driving the upper metal structure, bucket wheel mechanism, cantilever belt conveyor and other mechanisms to realize stacking and reclaiming operations and shunting operations on a certain material pile height working surface.

[0003] The existing slewing mechanism is composed of a slewing bearing, a slewing drive device, and upper and lower seat rings for fixing the slewing bearing. Among them, the bucket wheel excavator slewing mechanism cross-ground belt protection device adopts a cam limit or a pair of inductive limiters. However, since the angle range to be protected is a fan-shaped range of about plus or minus 15°, the angle range span is large, and the iron sheet induction block configured by the machine needs to be welded on the slewing platform as a whole. It is easy for the induction block to deform due to material accumulation and human factors, resulting in signal loss in the middle and failure, affecting the normal operation of the equipment. In addition, the cam limit protection device has the disadvantages of high cost, difficulty in installation location, and inconvenience for later maintenance.

[0004] In view of the above situation, it is urgent to develop a new cross-ground belt protection device that can protect the fan-shaped interval signal from interruption, meet the electrical control requirements, reduce the failure rate, and ensure the normal operation of the equipment. Utility Model Content

[0005] In view of the defects existing in the prior art, the purpose of the utility model is to provide a cross-ground belt protection device for a slewing mechanism, which can protect the slewing fan-shaped interval signal from interruption, meet the electrical control requirements, improve the stability of equipment operation, reduce the equipment failure rate, and ensure reliable operation of the equipment during operation.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a rotating mechanism cross-ground belt protection device, comprising a mounting bracket and a magnetic induction limit switch arranged on the mounting bracket;

[0008] The mounting bracket includes a first bracket, a second bracket and a third bracket; the first bracket is connected to the slewing mechanism; the second bracket and the third bracket are arranged on the slewing platform;

[0009] The magnetic induction limit switch includes a limit magnet, an S-polarity magnet and an N-polarity magnet arranged above the rotating platform; the limit magnet is arranged on the first bracket and rotates above the rotating platform with the first bracket; the S-polarity magnet is arranged on the second bracket, and the N-polarity magnet is arranged on the third bracket, and the S-polarity magnet and the N-polarity magnet are respectively arranged close to both sides of the rotating sector interval of the rotating mechanism.

[0010] Preferably, the first bracket is fixedly connected to the slewing bearing on the slewing mechanism.

[0011] Preferably, in the rotating sector section of the rotating mechanism, the angle between the radius where the S-polarity magnet is located and the radius where the N-polarity magnet is located is 30°±1°.

[0012] The beneficial effects of the slewing mechanism cross-ground belt protection device of the utility model are as follows:

[0013] 1. The utility model's slewing mechanism cross-ground belt protection device can protect the slewing sector interval signal from being interrupted, meet the electrical control requirements, improve the stability of equipment operation, reduce the equipment failure rate, and ensure reliable operation of the equipment during operation;

[0014] 2. The utility model has a simple structure, high control accuracy and low replacement and maintenance costs;

[0015] 3. The utility model adopts a magnetic induction limit switch, which has fast response speed, high precision, simple structure and low maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0017] Figure 1 It is a structural schematic diagram of the cross-ground belt protection device of the slewing mechanism of the utility model;

[0018] Figure 2 This is a schematic diagram of the magnetic induction limit switch of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the mounting bracket of the utility model;

[0020] Figure 4 This is a schematic diagram of the installation of the limiting magnet of the utility model;

[0021] In the figure, 1. limit magnet, 2. N-polarity magnet, 3. S-polarity magnet, 4. rotary platform, 5. first bracket; 6. second bracket; 7. third bracket; 8. rotary bearing; A. rotary sector section; K, L are the boundaries of the rotary sector section. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form.

[0023] The cross-ground belt protection device of the slewing mechanism of the bucket wheel excavator usually uses two inductive limit switches. Since the slewing angle range is plus or minus 15° and the angle range is relatively large, the sheet metal induction block of the mechanical configuration needs to be welded on the slewing platform as a whole, which is prone to material accumulation and deformation of the induction block, resulting in signal loss and affecting operating efficiency, while the electrical control system requires that the signal in this range be maintained; the starting point of the utility model is to meet the electrical control requirements, reduce the design cost, and improve the equipment operation stability, so a limit magnet 1 and two magnets of different polarities are used to meet the requirements of the electrical control system. The utility model uses a magnetic induction limit switch to detect the position of magnetic materials, and is more accurate and reliable, has a fast response speed, high precision, simple structure, and lower cost. At the same time, the first bracket 5 is used to lift the limit magnet 1 to prevent the influence of material accumulation.

[0024] Combination Figure 1 As shown, the utility model of the rotating mechanism cross-ground belt protection device includes a mounting bracket and a magnetic induction limit switch arranged on the mounting bracket. Figure 3 As shown, the mounting bracket includes a first bracket 5, a second bracket 6 and a third bracket 7; the first bracket 5 is connected to the slewing mechanism; the second bracket 6 and the third bracket 7 are both arranged on the slewing platform 4. Figure 1 As shown, the magnetic induction limit switch includes a limit magnet 1, an S polarity magnet 3 and an N polarity magnet 2 arranged above the rotating platform 4; the limit magnet 1 is arranged on the first bracket 5 and rotates with the first bracket 5 above the rotating platform 4; the S polarity magnet 3 is arranged on the second bracket 6, and the N polarity magnet 2 is arranged on the third bracket 7, and the S polarity magnet 3 and the N polarity magnet 2 are respectively arranged near the two sides of the rotating sector-shaped interval A of the rotating mechanism, for example, the S polarity magnet 3 is arranged near the K side boundary of the rotating sector-shaped interval A, and the N polarity magnet 2 is arranged near the L side boundary of the rotating sector-shaped interval A.

[0025] Combination Figure 2As shown, the working principle of the magnetic induction limit switch is: when the magnetic induction limit switch is close to an object, the magnetic field on the object will affect the magnetic material inside the magnetic induction switch, thereby changing the conduction state of the magnetic induction switch. According to this principle, the magnetic induction switch can detect and control the position of the material. The magnetic induction limit switch of the utility model is based on the above principle. When the limit magnet 1 is close to the S-polarity magnet 3 or the N-polarity magnet 2, the rotary sector section A is actuated, and the assignment of the protection signal will change accordingly, thereby protecting the rotary sector section A signal from interruption, meeting the electrical control requirements, improving the stability of equipment operation, reducing the equipment failure rate, and ensuring reliable operation during equipment operation.

[0026] Combination Figure 4 As shown, the first bracket 5 is fixedly connected to the slewing bearing 8 of the slewing mechanism. The rotation of the slewing bearing 8 drives the first bracket 5 to rotate, thereby driving the limiting magnet 1 to rotate above the slewing platform 4. In addition, the first bracket 5 can lift the limiting magnet 1 to prevent the influence of material accumulation.

[0027] Combination Figure 3 As shown, the second bracket 6 and the third bracket 7 are fixed on the rotating platform, the S-polarity magnet 3 is installed on the second bracket 6, and the N-polarity magnet 2 is installed on the third bracket 7. The two polarity magnets are raised by the two brackets to prevent material accumulation, and at the same time, the brackets can be easily pulled out for replacement during subsequent maintenance.

[0028] Combination Figure 1 As shown, in the rotating sector-shaped interval A of the rotating mechanism, the angle between the radius where the S-polarity magnet 3 is located and the radius where the N-polarity magnet 2 is located is 30°±1°, and the S-polarity magnet 3, the N-polarity magnet 2 and the limiting magnet 1 are all arranged above the rotating platform 4; the utility model ensures that the signal in the rotating sector-shaped interval A will not be interrupted through the relative position of the limiting magnet 1, the S-polarity magnet 3 and the N-polarity magnet 2, and the action response speed is fast, the precision is high, the structure is simple, and the requirements of the electrical control system are met.

[0029] Combination Figure 1As shown, when the slewing mechanism cross-ground belt protection device of the utility model is in use, when the operator needs to change the yard operation, the slewing mechanism cross-ground belt protection device plays a limiting role. Take the counterclockwise rotation of the limiting magnet 1 as an example. When the limiting magnet 1 rotates toward the slewing sector A along with the slewing bearing on the slewing mechanism, when the S-polarity magnet 3 (or the N-polarity magnet 2) senses the limiting magnet 1, the slewing sector A is actuated, and the protection signal changes from 0 to 1. At this time, the pitch mechanism cannot be lowered, protecting the bucket wheel excavator from hitting the ground belt conveyor due to the driver's operation of the lowering action. Continue to operate the slewing mechanism to the other side of the slewing sector A. After the N-polarity magnet 2 senses the limiting magnet 1, the protection signal changes from 1 to 0, indicating that the interval protection range has been left. At this time, the pitching up and down actions can be operated normally, and the yard on the other side is allowed to continue the operation.

[0030] In order to verify the effect of the optimized design, at the site of bucket wheel excavator use, the original inductive limit was unreliable, the signal holding interval span was too large, the signal was easily lost, and the cross-ground operation efficiency was affected; and the cam limit protection device was not suitable due to its high cost, difficulty in installation position, and inconvenient maintenance and other shortcomings. After the utility model is put into use, the cross-ground belt protection device of the slewing mechanism is stable and reliable during the user's operation, practical and convenient, and easy to repair, which greatly reduces the user's future fault maintenance costs. The utility model slewing mechanism cross-ground belt protection device can not only be used as a standardized cross-ground belt protection device for the slewing mechanism of bucket wheel excavators, but can also be used for cross-ground belt protection of the slewing mechanism of ship loaders. Such optimized application can make the operation of bulk cargo machines more stable, convenient, and practical.

[0031] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A belt protection device for a slewing mechanism across the ground, characterized in that: It includes a mounting bracket and a magnetic induction limit switch arranged on the mounting bracket; The mounting bracket includes a first bracket, a second bracket and a third bracket; the first bracket is connected to the slewing mechanism; the second bracket and the third bracket are arranged on the slewing platform; The magnetic induction limit switch includes a limit magnet, an S-polarity magnet and an N-polarity magnet arranged above the rotating platform; the limit magnet is arranged on the first bracket and rotates above the rotating platform with the first bracket; the S-polarity magnet is arranged on the second bracket, and the N-polarity magnet is arranged on the third bracket, and the S-polarity magnet and the N-polarity magnet are respectively arranged close to both sides of the rotating sector interval of the rotating mechanism.

2. The slewing mechanism cross-ground belt protection device according to claim 1, characterized in that: The first bracket is fixedly connected to the slewing bearing on the slewing mechanism.

3. The slewing mechanism cross-ground belt protection device according to claim 1, characterized in that: In the rotating sector section of the rotating mechanism, the angle between the radius where the S-polarity magnet is located and the radius where the N-polarity magnet is located is 30°±1°.

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